Introduction to Basic Manufacturing Processes and ... - always yours

Pincer
Carpentry 175
Pincers are commonly used for withdrawing nails. They are made of cast steel, the jaws
being hardened. The end of one of the arms is shaped to form a claw for removing nails. The
nail head is firmly gripped between the jaws as the long arms permit considerable pressure
to be exerted by them. The nail is extracted from the wooden body by a leveling action, using
the curved side of one of the jaws as a fulcrum. A small block of wood placed between the
steel jaw and the work prevents damage to the surface of the wood.
Various types and sizes of screws are available in different sizes from 6 mm to 150 mm
and are sold in market by numbers. A hole is drilled before putting the screw and then same
is driven into former by means of a screw driver.
Bolts and nuts are used only where very heavy components are to be fastened together
viz., wooden roof trusses and folding type furniture etc. The standard B.S.W. mild steel bolts
and nuts are used.
9.13 COMMON WOOD JOINTS
All wooden objects whether doors, windows, furniture, pattern, core boxes, handicrafts, toys,
cots, etc., are all assembled with joints. The various common used wood working joints are
given through Fig. 9.34 to Fig. 9.41.
A
A
B
Groove
Tongue
B
Fig. 9.34 Groove and tongue joint
Fig. 9.35 Mortise and tennon joint
A
A
A
A
B
B
B
B
Fig. 9.36 T-lap joint
Fig. 9.37 Open or through dove-tail joint